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Eighth Grade (Grade 8) Tectonics Questions

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Grade 8 Tectonics
In the early 1900s, scientist Alfred Wegener hypothesized that the continents were once one landmass that moved apart over time. The map supports which piece of evidence for Wegener's idea?
Map of the Atlantic
  1. the shapes of the continental coastlines roughly fit together
  2. distribution of coal deposits matches across different continents
  3. parts of different continents share similar fossils and similar rocks
  4. the age of oceanic crust is younger in the middle of the ocean and older at continental boundaries
Grade 8 Tectonics
Why do so many volcanoes form on convergent and divergent plate boundaries?
  1. Convergent and divergent plates have nothing to do with volcanoes.
  2. Melting plates cause magma to form beneath the surface.
  3. These plates get pushed up and create volcanoes.
Grade 8 Tectonics
What is the name of the instrument that measures seismic waves?
  1. seismograph
  2. seismoscope
  3. generator
  4. meter stick
Grade 8 Tectonics
Many earthquakes happen along the borders of                .
  1. countries
  2. climate zones
  3. tectonic plates
  4. all of these
Grade 8 Tectonics
Continental drift is the theory that continents drift
  1. slowly together.
  2. quickly together.
  3. to form the new continent Pandora.
  4. slowly to their current positions.
Grade 8 Tectonics
The lithospheric plates move an average of
  1. 2 kilometers per year.
  2. 5 centimeters per year.
  3. 9 inches per year.
  4. 3 feet per year.
Grade 8 Tectonics
Seismic waves start at the                .
  1. epicenter
  2. focus
  3. seismopoint
  4. seismic gap
Grade 8 Tectonics
What is the point on Earth's surface directly above an earthquake's focus?
  1. focus
  2. circumcenter
  3. epicenter
  4. incenter
Grade 8 Tectonics
What are the slowest seismic waves?
  1. surface
  2. primary
  3. secondary
  4. pressure
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